Multiple Windows Tkinter Toplevel, Object Oriented Python 3.3

Code creating multiple windows in Python 3.3 using Tkinter and an object oriented approach. For a basic intro to windows, widgets, buttons, labels and Entry boxes (non OO) check: http://www.youtube.com/watch?v=EwdKxDXAGBs Código y explicación. Programa en Python 3.3 usando Tkinter para crear GUIs.